王哲,王新南,商国强,祝力伟,李静,费跃,田帅,朱知寿.新型超高强韧钛合金热变形行为研究[J].稀有金属材料与工程,2018,47(3):810~815.[Wang Zhe,Wang Xinnan,Shang Guoqiang,Zhu Liwei,Li Jing,Fei Yue,Tian Shuai,Zhu Zhishou.Study on hot deformation behavior of new high strength and toughness titanium alloy[J].Rare Metal Materials and Engineering,2018,47(3):810~815.]
新型超高强韧钛合金热变形行为研究
投稿时间:2016-01-19  修订日期:2016-05-26
中文关键词:  TB17钛合金  热压缩模拟  Arrhenius型本构方程  动态再结晶
基金项目:装备预先研究项目(项目号51312JQ01)
中文摘要:
      本文采用Gleeble3800热压缩模拟试验机研究了新型超高强韧TB17钛合金775℃~905℃温度范围内、应变速率0.001s-1~10s-1条件下的热变形行为。分析了该合金在热变形过程中流变应力软化特点及显微组织演变规律,建立了该合金Arrhenius型本构方程。试验结果表明:采用不同变形温度,TB17钛合金峰值应力对应变速率敏感程度不同,在相变温度以下变形时,峰值应力对低应变速率敏感,而在相变温度以上变形,峰值应力对高应变速率敏感。应变速率对TB17钛合金显微组织具有重要影响,合金应变速率大于0.1s-1时,以发生动态回复为主,而应变速率为0.001 s-1~0.1s-1时以发生动态再结晶为主;降低应变速率有利于动态再结晶发生,合金在应变速率0.001s-1时可获得约25μmβ的晶粒。变形温度对动态再结晶具有重要影响,在相变温度以下变形仅发生初生α相再结晶,而相变温度以上变形则发生β相动态再结晶。TB17钛合金相变点温度以下的热变形激活能为538.4KJ/mol,相变点温度以上的热变形激活能为397.4KJ/mol,该合金在775℃~905℃热变形软化机制为晶界滑移机制。
Study on hot deformation behavior of new high strength and toughness titanium alloy
英文关键词:TB17 titanium alloy  mechanical simulator  Arrhenius type constitutive equation  dynamic recrystallization
英文摘要:
      The hot deformation behaviors of a new type high strength and toughness TB17 titanium alloy was investigated on the thermo mechanical simulator (Gleeble3800). The experiment conducted at temperatures ranging from 775 °C to 905 °C and strain rates various from 0.001 s?1 to 1 s?1. The softening mechanism of flow stress and microstructure were investigated during hot deformation process and the Arrhenius type constitutive equation were established as well. The stress of TB17 titanium alloy varies with sensitivity of the strain rate at defferent deformation temperatures. Duing deforming at α+β field,the peak stress was sensitive to low strain rates,while at β field deforming,the peak stress was sensitive to high strain rates. The strain rate has a major impact on the microstructure of TB17 titanium alloy. The dynamic recovery mechanisms plays an dominant role as the strain rate exceeds 0.1s-1. Dynamic recrystallization plays an significant role while the strain rate is in the range of 0.001 s-1~0.1s-1. Recrystallization processing can be promoted with the decreasing of strain rate. The microstructure of equiaxed grains with a size of 25μm was obtained with a strain rate of 0.001 s-1. The temperature also has great influence on the dynamic recrystallization. During deformed at α+β field lead to primary α phase recrystallization, while at β field lead to the β grain recrystallization. The activation energy for hot deformation below and above the temperature of phase transformation point is 538.4KJ/mol and 397.4KJ/mol, respectively. The softening mechanism of hot deformation temperature ranged from 775 to 905℃ transformation point is grain boundary glide.
作者单位E-mail
王哲 北京航空材料研究院 tianchenzhe@163.com 
王新南 北京航空材料研究院  
商国强 北京航空材料研究院  
祝力伟 北京航空材料研究院  
李静 北京航空材料研究院  
费跃 北京航空材料研究院  
田帅 北京航空材料研究院  
朱知寿 北京航空材料研究院 zhuzzs@126.com 
摘要点击次数: 312
全文下载次数: 97
查看全文  查看/发表评论  下载PDF阅读器
关闭